28786408361 has 8 divisors (see below), whose sum is σ = 29615085864. Its totient is φ = 27963758080.

The previous prime is 28786408349. The next prime is 28786408433. The reversal of 28786408361 is 16380468782.

It can be written as a sum of positive squares in 4 ways, for example, as 543589225 + 28242819136 = 23315^2 + 168056^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28786408361 - 2¹⁸ = 28786146217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28786408561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1497116 + ... + 1516221.

It is an arithmetic number, because the mean of its divisors is an integer number (3701885733).

Almost surely, 2^28786408361 is an apocalyptic number.

It is an amenable number.

28786408361 is a deficient number, since it is larger than the sum of its proper divisors (828677503).

28786408361 is a wasteful number, since it uses less digits than its factorization.

28786408361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013611.

The product of its (nonzero) digits is 3096576, while the sum is 53.

The spelling of 28786408361 in words is "twenty-eight billion, seven hundred eighty-six million, four hundred eight thousand, three hundred sixty-one".